Hello, during a lightning storm the lights were dimming/flashing and now the RB951 wont come on.

I'm going to assume there isn't much I can do, but does anyone have an ideas ? I tried plugging directly in to wall and everything.

If you have access to a volt meter, check the output of the power supply to see if it's producing power. Also, you can try a different power supply - provided you have another one that has the right connector and polarity, and an acceptable voltage.

Hello, during a lightning storm the lights were dimming/flashing and now the RB951 wont come on.

I'm going to assume there isn't much I can do, but does anyone have an ideas ? I tried plugging directly in to wall and everything.

No LEDs are on? In such case first check power supply as written above.
Also you can try PoE for power supply.
Sometimes people restored RB after thunderstorms with help of netinstall ( http://wiki.mikrotik.com/wiki/Manual:Netinstall ) because strong lightning caused broke information in internal routers memory without broke router itself.